Explore TMB and number of mutations across multiple timepoints of the PBTA Cohort

Tumor evolution project

Data used

In this notebook, we are using the tmb_genomic.tsv file generated from the 01-preprocess-data.Rmd script.

Set up

suppressPackageStartupMessages({
  library(tidyverse)
  library(scales)
})

Directories and File Inputs/Outputs

# Detect the \.git\ folder. This will be in the project root directory.
# Use this as the root directory to ensure proper sourcing of functions
# no matter where this is called from.
root_dir <- rprojroot::find_root(rprojroot::has_dir(\.git\))
scratch_dir <- file.path(root_dir, \scratch\)
analysis_dir <- file.path(root_dir, \analyses\, \tmb-vaf-longitudinal\) 
input_dir <- file.path(analysis_dir, \input\)

# File path to results directory
results_dir <-
  file.path(analysis_dir, \results\)
if (!dir.exists(results_dir)) {
  dir.create(results_dir)
}

# Input files
tmb_genomic_file <- file.path(scratch_dir, \tmb_vaf_genomic.tsv\)
palette_file <- file.path(root_dir, \figures\, \palettes\, \tumor_descriptor_color_palette.tsv\)

# File path to plots directory
plots_dir <-
  file.path(analysis_dir, \plots\)
if (!dir.exists(plots_dir)) {
  dir.create(plots_dir)
}

# File path to dumbbell plots directory
dumbbell_plots_dir <-
  file.path(plots_dir, \dumbbell\)
if (!dir.exists(dumbbell_plots_dir )) {
  dir.create(dumbbell_plots_dir )
}



source(paste0(analysis_dir, \/util/function-create-barplot.R\))
source(paste0(analysis_dir, \/util/function-create-dumbbell-plot.R\))
source(paste0(root_dir, \/figures/scripts/theme.R\))

Read in data and process

# Read and process tmb_genomic file
df_total <- readr::read_tsv(tmb_genomic_file, guess_max = 100000, show_col_types = FALSE) %>% 
  group_by(Kids_First_Participant_ID) %>% 
  mutate(cg_distinct = n_distinct(cancer_group) > 1) # to identify samples with different diagnosis across timepoints

# Are there any samples with both WGS and WXS? 
df_total %>% 
  unique() %>% 
  arrange(Kids_First_Participant_ID, experimental_strategy) %>%
  group_by(Kids_First_Participant_ID) %>%
  dplyr::summarise(experimental_strategy_sum = str_c(experimental_strategy, collapse = \;\)) 
# There are, so let's remove these from downstream analyses.
df <- df_total %>% 
  filter(!experimental_strategy == \WXS\) %>% 
  dplyr::mutate(patient_id = paste(short_histology, Kids_First_Participant_ID, sep = \_\)) %>% 
  distinct(cancer_group, .keep_all = TRUE) %>% 
  summarise(cg_sum = str_c(cancer_group, collapse = \

# A tibble: 38 × 2
   cg_sum                                n
   <chr>                             <int>
 1 High-grade glioma                107604
 2 Low-grade glioma                  38088
 3 Atypical Teratoid Rhabdoid Tumor  27090
 4 Sarcoma,Rosai-Dorfman disease     19705
 5 Medulloblastoma                   11943
 6 Diffuse midline glioma             9944
 7 Medulloblastoma,Meningioma         4331
 8 CNS Embryonal tumor                1800
 9 Ganglioglioma                      1312
10 Ewing sarcoma                      1106
# ℹ 28 more rows

# Let's summarize cancer groups with < 10 bs_samples as Other and use this for visualization purposes
cg_sum_df <- df %>% 
  count(cg_sum) %>% 
  dplyr::mutate(cg_sum_n = glue::glue(\{cg_sum} (N={n})\))

df <- df %>% 
  left_join(cg_sum_df, by = c(\cg_sum\)) %>% 
  mutate(cg_plot = case_when(n < 10 ~ \Other\,
                             TRUE ~ cg_sum),
         cg_kids_id = paste(cg_sum, Kids_First_Participant_ID, sep = \_\))

# How many bs_samples per cg_plot?
print(df %>% count(cg_plot) %>% arrange(desc(n))) 

# A tibble: 38 × 2
   cg_plot                               n
   <chr>                             <int>
 1 High-grade glioma                107604
 2 Low-grade glioma                  38088
 3 Atypical Teratoid Rhabdoid Tumor  27090
 4 Sarcoma,Rosai-Dorfman disease     19705
 5 Medulloblastoma                   11943
 6 Diffuse midline glioma             9944
 7 Medulloblastoma,Meningioma         4331
 8 CNS Embryonal tumor                1800
 9 Ganglioglioma                      1312
10 Ewing sarcoma                      1106
# ℹ 28 more rows

# Read color palette
palette_df <- readr::read_tsv(palette_file, guess_max = 100000, show_col_types = FALSE)

# Define and order palette
palette <- palette_df$hex_codes
names(palette) <- palette_df$color_names

# length(unique(df$Kids_First_Participant_ID))

TMB per Patient case

We will explore TMB per Kids_First_Participant_ID over time by creating stacked barplots.

# Define parameters for function
ylim = max(df$tmb)
x_value <- df$Kids_First_Participant_ID

# Re-order df
f <- c(\Second Malignancy\, \Unavailable\, \Deceased\, \Recurrence\, \Progressive\, \Diagnosis\) # Level df by timepoints
df_plot <- df %>% 
  dplyr:::mutate(tumor_descriptor = factor(tumor_descriptor),
                 tumor_descriptor = fct_relevel(tumor_descriptor, f)) 
# Run function
fname <- paste0(plots_dir, \/\, \TMB-genomic-total.pdf\)
print(fname)

[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/TMB-genomic-total.pdf\

p <- create_stacked_barplot(tmb_df = df_plot, ylim = ylim, x = x_value, palette = palette)

pdf(file = fname, width = 22, height = 6)
print(p)
dev.off()

png 
  2 

Attention: Hypermutant TMB defined as ≥10 Mb, and Ultrahypermutant TMB defined as ≥100 mutations/Mb in pediatric brain tumors (https://pubmed.ncbi.nlm.nih.gov/29056344/).

Here, we notice that there are samples with high TMB (hyper-mutant samples). Next, we will exclude these samples (threshold >= 10) from downstream analysis. Attention is needed in cases with high number of mutations in only one timepoint as this will lead to un-matched longitudinal samples. We will also remove those so we always have matched longitudinal samples.

# Filter df and remove any samples with single timepoints
df_plot_filter <- df %>%
  filter(!tmb >= 10) %>%
  unique() %>% 
  arrange(Kids_First_Participant_ID, tumor_descriptor) %>%
  group_by(Kids_First_Participant_ID) %>%
  dplyr::summarise(tumor_descriptor_sum2 = str_c(tumor_descriptor, collapse = \;\)) %>% 
  dplyr::filter(!tumor_descriptor_sum2 %in% c(\Diagnosis\, \Progressive\, \Recurrence\, \Second Malignancy\, \Unavailable\, \Deceased\, \Diagnosis;Diagnosis\,\Progressive;Progressive\)) %>% 
  left_join(df, by = c(\Kids_First_Participant_ID\)) %>% 
  drop_na(tmb) %>% 
  mutate(cg_plot = str_replace(cg_plot, c(\/\), \ \),
         tumor_descriptor = factor(tumor_descriptor),
         tumor_descriptor = fct_relevel(tumor_descriptor, f)) %>% 
  arrange(tumor_descriptor) 
# length(unique(df_plot_filter$Kids_First_Participant_ID))


# Define parameters for function
ylim <- max(df_plot_filter$tmb)
df_plot_filter <- df_plot_filter
x_value <- df_plot_filter$cg_kids_id

# Run function
fname <- paste0(plots_dir, \/\, \TMB-genomic-no-hypermutants.pdf\)
print(fname)

[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/TMB-genomic-no-hypermutants.pdf\

p <- create_stacked_barplot(tmb_df = df_plot_filter, ylim = ylim, x = x_value, palette = palette)

pdf(file = fname, width = 25, height = 10)
print(p)
dev.off()

png 
  2 

TMB across timepoints and cancer types per Patient case

We will explore TMB per cancer group over time by creating dumbbell plots. We classified by using cancer types with the highest number of samples (High- and Low-grade gliomas) versus any other cancer groups.

# How many bs_samples per kids_id and cancer group?
# print(table(df_plot_filter$cg_plot))
print(df_plot_filter %>% 
        count(cg_plot, Kids_First_Participant_ID))

# A tibble: 117 × 3
   cg_plot                                          Kids_First_Participa…¹     n
   <chr>                                            <chr>                  <int>
 1 Adamantinomatous Craniopharyngioma               PT_CBTW4E3X               18
 2 Adamantinomatous Craniopharyngioma               PT_WYXTEG3E               46
 3 Adamantinomatous Craniopharyngioma               PT_YK7AD0KK               38
 4 Adamantinomatous Craniopharyngioma,Craniopharyn… PT_WWZWD4KC               20
 5 Adamantinomatous Craniopharyngioma,Meningioma    PT_T2M1338J               47
 6 Atypical Teratoid Rhabdoid Tumor                 PT_0WQFCZ6S              558
 7 Atypical Teratoid Rhabdoid Tumor                 PT_3KM9W8S8             1035
 8 Atypical Teratoid Rhabdoid Tumor                 PT_6N825561            20007
 9 Atypical Teratoid Rhabdoid Tumor                 PT_DVXE38EX             1782
10 Atypical Teratoid Rhabdoid Tumor                 PT_ESHACWF6             1431
# ℹ 107 more rows
# ℹ abbreviated name: ¹​Kids_First_Participant_ID

# Dumbbell plot per cancer group
cancer_groups <- unique(as.character(df_plot_filter$cg_plot))
cancer_groups <- sort(cancer_groups, decreasing = FALSE)
print(cancer_groups)

 [1] \Adamantinomatous Craniopharyngioma\                            
 [2] \Adamantinomatous Craniopharyngioma

for (i in seq_along(cancer_groups)) {
  print(i)
  df_ct_sub <- df_plot_filter %>% 
    filter(cg_plot == cancer_groups [i])
  
      if (i %in% c(3, 7, 8)) {
    print(cancer_groups [i])
    # Define parameters for function
    ylim <- 2
    } else if (i == 2) {
      print(cancer_groups [i])
      # Define parameters for function
      ylim <- 6
      } else {
        print(cancer_groups [i])
        # Define parameters for function
        ylim <- 4
      }
    

    # Name plots
    fname <- paste0(dumbbell_plots_dir, \/\, cancer_groups[i], \-TMB-dumbbell\, \.pdf\)
    print(fname)
    
    # Run function
    p <- create_dumbbell_ct(tmb_df = df_ct_sub, 
                                 ylim = ylim, 
                                 ct_id = cancer_groups[i],
                                 palette = palette)
    pdf(file = fname, width = 12, height = 8)
    print(p)
    dev.off()
}

[1] 1
[1] \Adamantinomatous Craniopharyngioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Adamantinomatous Craniopharyngioma-TMB-dumbbell.pdf\

[1] 2
[1] \Adamantinomatous Craniopharyngioma

[1] 3
[1] \Adamantinomatous Craniopharyngioma

[1] 4
[1] \Atypical Teratoid Rhabdoid Tumor\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Atypical Teratoid Rhabdoid Tumor-TMB-dumbbell.pdf\

[1] 5
[1] \Chordoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Chordoma-TMB-dumbbell.pdf\

[1] 6
[1] \Choroid plexus carcinoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Choroid plexus carcinoma-TMB-dumbbell.pdf\

[1] 7
[1] \CNS Embryonal tumor\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/CNS Embryonal tumor-TMB-dumbbell.pdf\

[1] 8
[1] \CNS Embryonal tumor

[1] 9
[1] \CNS Embryonal tumor

[1] 10
[1] \Diffuse leptomeningeal glioneuronal tumor

[1] 11
[1] \Diffuse midline glioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Diffuse midline glioma-TMB-dumbbell.pdf\

[1] 12
[1] \Dysembryoplastic neuroepithelial tumor\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Dysembryoplastic neuroepithelial tumor-TMB-dumbbell.pdf\

[1] 13
[1] \Dysembryoplastic neuroepithelial tumor

[1] 14
[1] \Ependymoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Ependymoma-TMB-dumbbell.pdf\

[1] 15
[1] \Ewing sarcoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Ewing sarcoma-TMB-dumbbell.pdf\

[1] 16
[1] \Ganglioglioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Ganglioglioma-TMB-dumbbell.pdf\

[1] 17
[1] \Ganglioglioma

[1] 18
[1] \Ganglioglioma

[1] 19
[1] \Hemangioblastoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Hemangioblastoma-TMB-dumbbell.pdf\

[1] 20
[1] \High-grade glioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/High-grade glioma-TMB-dumbbell.pdf\

[1] 21
[1] \Low-grade glioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Low-grade glioma-TMB-dumbbell.pdf\

[1] 22
[1] \Low-grade glioma

[1] 23
[1] \Low-grade glioma

[1] 24
[1] \Low-grade glioma

[1] 25
[1] \Medulloblastoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Medulloblastoma-TMB-dumbbell.pdf\

[1] 26
[1] \Medulloblastoma

[1] 27
[1] \Meningioma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Meningioma-TMB-dumbbell.pdf\

[1] 28
[1] \Neuroblastoma

[1] 29
[1] \Neurofibroma Plexiform\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Neurofibroma Plexiform-TMB-dumbbell.pdf\

[1] 30
[1] \Neurofibroma Plexiform

[1] 31
[1] \Pilocytic astrocytoma

[1] 32
[1] \Schwannoma\
[1] \/home/rstudio/pbta-tumor-evolution/analyses/tmb-vaf-longitudinal/plots/dumbbell/Schwannoma-TMB-dumbbell.pdf\

Total number of mutations across timepoints and biospecimen sample per Patient case

Here, we want to explore the number of mutations per timepoint and biospecimen sample per patient case.

samples <- unique(as.character(df_plot_filter$Kids_First_Participant_ID))
print(samples)

  [1] \PT_2ECVKTTQ\ \PT_82MX6J77\ \PT_98QMQZY7\ \PT_9PJR0ZK7\ \PT_T2M1338J\
  [6] \PT_WWRB8KDQ\ \PT_19GCSK2S\ \PT_1H2REHT2\ \PT_23NZGSRJ\ \PT_37B5JRP1\
 [11] \PT_394ZA6P7\ \PT_3AR6AW9N\ \PT_3KM9W8S8\ \PT_5NS35B66\ \PT_6N825561\
 [16] \PT_75HRTX4S\ \PT_8GN3TQRM\ \PT_CWVNNBPH\ \PT_CXT81GRM\ \PT_DNAJYFZT\
 [21] \PT_DR94DMTG\ \PT_DVXE38EX\ \PT_FA2F3HQG\ \PT_FN57KS79\ \PT_FWWRWTV2\
 [26] \PT_GTHZF21E\ \PT_HFQNKP5X\ \PT_HJMP6PH2\ \PT_KBFM551M\ \PT_KTRJ8TFY\
 [31] \PT_KZ56XHJT\ \PT_MDWPRDBT\ \PT_MNSEJCDM\ \PT_NJQ26FHN\ \PT_NZ85YSJ1\
 [36] \PT_PR4YBBH3\ \PT_RJ1TJ2KH\ \PT_SD4RJ57T\ \PT_WYXTEG3E\ \PT_YND59052\
 [41] \PT_Z4BF2NSB\ \PT_00G007DM\ \PT_0DWRY9ZX\ \PT_0WQFCZ6S\ \PT_2MZPGZN1\
 [46] \PT_2YT37G8P\ \PT_3T3VGWC6\ \PT_7M2PGCBV\ \PT_89XRZBSG\ \PT_962TCBVR\
 [51] \PT_99S5BPE3\ \PT_BRVGRXQY\ \PT_BZCJMEX8\ \PT_C1RDBCVM\ \PT_CBTW4E3X\
 [56] \PT_CWXSP19D\ \PT_D6AJHDST\ \PT_DFQAH7RS\ \PT_EQX0VT4F\ \PT_HHG37M6W\
 [61] \PT_HXV713W6\ \PT_JP1FDKN9\ \PT_KMHGNCNR\ \PT_N8W26H19\ \PT_NPETR8RY\
 [66] \PT_PF04R0BH\ \PT_PFA762TK\ \PT_QH9H491G\ \PT_S2SQJVGK\ \PT_T4VN7ZRB\
 [71] \PT_TP6GS00H\ \PT_W6AWJJK7\ \PT_XZGWKXC5\ \PT_YK7AD0KK\ \PT_Z4GS3ZQQ\
 [76] \PT_ZZRBX5JT\ \PT_02J5CWN5\ \PT_04V47WFC\ \PT_1ZAWNGWT\ \PT_25Z2NX27\
 [81] \PT_2FVTD0WR\ \PT_39H4JN6H\ \PT_3GYW6P6P\ \PT_3P3HARZ2\ \PT_3R0P995B\
 [86] \PT_3VCS1PPF\ \PT_5CYJ3NZ9\ \PT_5ZPPR06P\ \PT_62G82T6Q\ \PT_6S1TFJ3D\
 [91] \PT_773ZPTEB\ \PT_7WYPEC3Q\ \PT_9S6WMQ92\ \PT_AQWDQW27\ \PT_AV0W0V8D\
 [96] \PT_B5DQ8FF0\ \PT_ESHACWF6\ \PT_FN4GEEFR\ \PT_HE8FBFNA\ \PT_JNEV57VK\
[101] \PT_JSFBMK5V\ \PT_K8ZV7APT\ \PT_NK8A49X5\ \PT_P571HTNK\ \PT_PAPEQ0T0\
[106] \PT_QJDY4Y9P\ \PT_S4YNE17X\ \PT_TKWTTRQ7\ \PT_TRZ1N1HQ\ \PT_VTG1S395\
[111] \PT_WP871F5S\ \PT_WWZWD4KC\ \PT_XA98HG1C\ \PT_XTVQB9S4\ \PT_Y98Q8XKV\
[116] \PT_YGN06RPZ\ \PT_ZMKMKCFQ\

for (i in seq_along(samples)) {
  print(i)
  tmb_sub <- df_plot_filter %>%
    filter(Kids_First_Participant_ID == samples[i])
  
  # Define parameters for function
  ylim = max(df_plot_filter$mutation_count)
 
  # Run function
  p <- create_barplot_sample(tmb_df = tmb_sub,
                             ylim = ylim,
                             sid = samples[i],
                             palette = palette)
  print(p)
}

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sessionInfo()

R version 4.2.3 (2023-03-15)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 22.04.2 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
 [1] ggthemes_4.2.4  scales_1.2.1    lubridate_1.9.2 forcats_1.0.0  
 [5] stringr_1.5.0   dplyr_1.1.1     purrr_1.0.1     readr_2.1.4    
 [9] tidyr_1.3.0     tibble_3.2.1    ggplot2_3.4.0   tidyverse_2.0.0

loaded via a namespace (and not attached):
 [1] highr_0.10       bslib_0.4.2      compiler_4.2.3   pillar_1.9.0    
 [5] jquerylib_0.1.4  tools_4.2.3      bit_4.0.5        digest_0.6.31   
 [9] timechange_0.2.0 jsonlite_1.8.4   evaluate_0.20    lifecycle_1.0.3 
[13] gtable_0.3.3     pkgconfig_2.0.3  rlang_1.1.0      cli_3.6.1       
[17] parallel_4.2.3   yaml_2.3.7       xfun_0.38        fastmap_1.1.1   
[21] withr_2.5.0      knitr_1.42       generics_0.1.3   vctrs_0.6.2     
[25] sass_0.4.5       hms_1.1.3        bit64_4.0.5      rprojroot_2.0.3 
[29] tidyselect_1.2.0 glue_1.6.2       R6_2.5.1         fansi_1.0.4     
[33] vroom_1.6.1      rmarkdown_2.21   farver_2.1.1     tzdb_0.3.0      
[37] magrittr_2.0.3   htmltools_0.5.5  colorspace_2.1-0 labeling_0.4.2  
[41] utf8_1.2.3       stringi_1.7.12   munsell_0.5.0    cachem_1.0.7    
[45] crayon_1.5.2